Question

[rtghguuyt]

1 be chua nuoc dang hinh hop chu nhat co kich thuoc trong long be la : chieu dai 4m chieu rong 3m chieu cao 2.5m biet rang 80% the tich cua be la chua nuoc hoi:

a co bao nhieu lit nuoc 

b muc nuoc cao bao nheu m